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years of the history of the Solar System, there were more unstable high-mass nuclides in existence, and the four chains were longer, as they included nuclides that have since decayed away. Notably, ²⁴⁴Pu, ²³⁷Np, and ²⁴⁷Cm have half-lives over a million years and would have then been bottlenecks higher in the 4n, 4n+1, and 4n+3 chains respectively - ²⁴⁴Pu and ²⁴⁷Cm have been identified as having been present. (There is no nuclide with a half-life over a million years above ²³⁸U

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